二维开缝圆柱环流动力特性

使用粒子图像测速(PIV)技术对各二维开缝圆柱环流流场的动力特性进行定性及定量研究,揭示雷诺数(Re)、开缝位置角、开缝倾角及相对缝宽(s/d,s为缝隙宽度,d为圆柱直径)对环流动力特性的影响规律.获取瞬态流场、时均流场以及斯特劳哈尔数(Sr)等关键流场信息,研究开缝圆柱环流流场的结构及演变规律.结果表明:脱落涡与圆柱表面环流的此消彼长,引起120°以及180°开缝圆柱的吹吸效应,显著提前圆柱尾流脱落涡的耦合时间;240°开缝圆柱的缝隙位置接近圆柱后缘,流体未达到缝隙位置时已经发生流动分离,不会形成有效吹吸效应;120°以及180°开缝圆柱的尾流脱落涡运动轨迹振幅较大,其流阻系数大于基准圆柱以及240°开缝圆柱的尾流流阻系数;狭缝角α为180°,相对缝宽为0.15开缝圆柱的尾流Sr在0.218～0.225范围内波动最小,具备最优的线性稳定性.装备预研教育部联合基金(6141A02033529)国家自然科学基金(11072206)福建省自然科学基金(2012J01023)资助项

穿爆弹撞靶效应数值分析

利用流体弹塑性模型和欧拉算法对穿爆弹撞击有限尺度模拟靶的力学效应进行了数值分析。给出了撞靶过程中各物理量的变化，分析了靶板尺度、撞靶速度对撞靶效应的影响

低聚倍半硅氧烷基铁络合物阻燃剂的合成及改性环氧树脂

采用Kabachnik-Fields反应合成出含有邻苯二酚功能团、磷杂菲基团和笼型倍半硅氧烷结构基元的新型配体POSS-DOPO-Catechol（PDC）,再与Fe3+配位络合形成低聚倍半硅氧烷基铁络合物Fe（PDC）3,进一步加入双酚A型环氧树脂（EP）进行固化制备出EP/Fe（PDC）3复合材料。利用红外、质谱和核磁共振表征配体及络合物的化学结构;通过差示扫描量热分析、热重分析、氧指数测定、微形量热、动态力学实验等方法研究铁络合物Fe（PDC）3的引入对环氧树脂固化温度、热性能、阻燃性能、力学性能及介电性能的影响。结果表明,添加Fe（PDC）3可以降低环氧树脂的固化温度、热释放速率及总热释放量,提高残炭量、氧指数,这是由于铁络合物可以有效促进材料在高温下形成稳定性良好的致密炭层,起到隔氧隔热作用,从而在燃烧过程中阻止材料进一步燃烧。国家自然科学基金资助项目(51573150);;\n福建省自然科学基金计划资助项目(2018J01079);;\n福建省技术重大研发平台项目(2014H2006);;\n福建省科技重大项目(2013HZ0005-1

早熟优质籼稻三系不育系伍天A的选育

【目的】选育早熟优质三系不育系,为优质稻新品种选育奠定基础。【方法】2007年早季以泉5B/天丰B的F4代为父本,与不育系泉5A测交,经过多代回交和多年观察筛选,选育早熟优质三系不育系新品种。【结果】选育出的早熟优质不育系伍天A,于2019年通过福建省农作物品种审定委员会审定(闽审稻20190047),表现育性稳定,不育株率100%,不育度99.99%;异交率高,柱头总外露率64.77%;米质优,稻米的主要品质指标:整精米率66.0%、粒长6.7 mm、长宽比3.4、垩白粒率4%、垩白度0.6%、透明度1级、碱消值7.0级、胶稠度50 mm、直链淀粉含量23.8%,其中整精米率、垩白度、透明度、碱消值均达到NY/T593-2013《食用稻品种品质》一等食用籼稻品种品质标准,但胶稠度、直链淀粉含量等指标还不够理想,需在保持其优质早熟等优良特性的基础上,对品质性状进行改造提升;早熟,播始历期均在66 d左右,与天丰A相同;配合力强,伍天A与R713配组育成的三系稻新组合——伍天A/R713于2019年通过福建省农作物品种审定委员会审定(闽审稻20190035)。【结论】伍天A是一个育性稳定、异交率高、米质优、早熟、配合力强的三系不育系,可以配制出优质、多种熟期的三系杂交水稻新组合

铟硼磷酸盐结构中的交叠生长规律研究

Several indium borophosphates have been reported recently, including KIn[BP2O8(OH)](I) and NaIn[BP2O8(OH)](H). The latter two compounds were synthesized under mild hydrothermal conditions, and have the same molar ratio (M-I:In:B:P:O:H) in molecular formula but with different structure types. Compound I crystallizes in the triclinic system with space group P (1) over bar (No.2), a=0.52638(4) nm, b=0.84791(5) nm, c=0.81469(9) nm, alpha=91.1741(7)degrees, beta=93.061(7)degrees, gamma=79.823(5)degrees, V=0.3573 nm(3), Z=2; while compound II possesses a monoclinic structure with space group P2(1)/n (No.14) with a=0.5177(1) nm, b=1.6815(3) nm, c=0.7684(2) nm, beta=94.10(3)degrees, V=0.6672(2) nm(3), Z=4. Eight- membered-ring and six-membered-ring are formed by alternating borate, phosphate tetrahedra and In-coordination octahedron sharing corners via common oxygen atoms in compound I and H respectively. The polyhedra in the structure are oriented along certain direction to form alternating layered fragments. These two structure types can be considered as intergrowth structures, which consist of the same layered fragments growing in different orientations. Other structure intergrowth possibilities are also expected in similar systems

近十年(2004-2013)年我国高校师德问题研究述论

师德问题是近年来全社会普遍关注的问题,高校师德问题更是师德问题的重中之重。从2004年至2013年,学者们从不同视角对高校师德问题进行了研究。已有的研究成果主要集中在特定背景下的高校师德研究、高校师德建设存在的问题及成因、高校师德建设对策研究等三个维度,其中高校师德建设对策研究最受研究者关注。高校师德研究虽取得了一系列重要的研究成果,但存在着重理论研究轻实证研究、重本土研究轻比较研究、研究视角不均衡等方面的不足。因此,高校师德研究应在这几个方面有所突破,有所创新。&nbsp;</p

THE TEMPERATURE DISTRIBUTION IN A SUBSTRATE RADIATIVELY HEATED IN VACUUM

真空辐射加热下基片表面温度分布的均匀性是薄膜制备中的关键问题之一。采用数值计算和比色红外测温两种方法，研究了作者自行研制的真空辐射加热器（IMCAS-VRH）的性能。利用IMCAS-VRH加热直径6in的单晶硅基片,当电功率为3860W时，基片表面平均温度为1093K,整个基片上的温度变化的测量值约为6 K。基片表面温度分布的计算结果与测量数据符合得很好，进一步的计算分析表明钼丝对辐射的遮挡效应、隔热屏和基片热传导等对基片温度分布均匀性有重要影响

Indicator system for assessing mangrove ecological degradation and a case study of the Zhangjiang Estuary

通过总结目前红树林面临的各类生态退化机制,利用“压力-状态-响应(PSr)“分析模型,构建了红树林生态退化机制评估指标体系,并应用于福建省漳江河口红树林生态系统的案例研究.评价结果显示:漳江河口红树林生态退化压力仍处在较小的范围内,主要压力源来自生物入侵以及海岸带水产养殖和围垦;对影响显著的生态退化因子已经采取了有效的控制措施;保持并加强保护措施,将有助于当地红树林生态系统在未来维持稳定的状态.An assessment indicator system was constructed based on a summary of various mangrove ecological degradation mechanisms using a 'Pressure-State-Response(PSR)' model.This model was then applied to a case study of mangroves in the Zhangjiang Estuary of Fujian Province.The results showed that the mangrove is facing small ecological stress that mainly stems from alien species invasion,coastal reclamation and aquaculture.Several influential ecological degradations have been effectively controlled by conservation measures,which will contribute to maintaining the stable state of the mangrove in the near future.国家908专项资助项目(908-02-04-04);福建省908专项资助项目(FJ908-02-02-04

Studies on the Intergrowth Structures in Indium(In)Borophosphates

Several indium borophosphates have been reported recently,including K In[BP 2 O 8 (OH)]( Ⅰ )and NaIn[BP 2 O 8 (OH)]( Ⅱ ).The latter two compounds were synthesized under mild hydrothermal condit ions,and have the same molar ratio(M Ⅰ ∶In∶B∶P∶O∶H)in molecular formula but with different structure types.C ompound Ⅰ crystallizes in the triclinic system with space group P1(No.2), a =0.52638(4)nm, b =0.84791(5)nm, c =0.81469(9)nm,α=91.1741(7)°,β=93.061(7) °,γ=79.823(5)°, V =0.3573nm 3 ,Z=2;while compound Ⅱ possesses a monoclinic structure with space group P 2 1 / n (No.14)with a =0.5177(1)nm, b =1.6815(3)nm, c =0.7684(2)nm,β=94.10(3)°, V =0.6672(2)nm 3 ,Z=4.Eight-membered-ring and six-membered-ring are formed by alterna ting borate,phosphate tetrahedra and In-coordination octahedron sharing corner s via common oxygen atoms in compound Ⅰ and Ⅱ respectively.The polyhedra in the structure are oriented along certain dire ction to form alternating layered fragments.These two structure types can be co nsidered as intergrowth structures,which consist of the same layered fragments growing in different orientations.Other structure intergrowth possibilities are also expected in similar systems.CSD: Ⅰ ,409583; Ⅱ ,413343.国家杰出 青年基金项目(No．20025101);; 国家科技部863项目(No．2002AA324 070);; 上海市光科技项目(No．02

Investigations on Transition-metal and Main-group-element Borophosphate Systems

总结了作者近几年在硼磷酸盐研究中所合成和表征的 10多个新化合物 ,即元素周期表第 4周期从 Cr至 Ga的元素或氧化物与工业催化剂材料 BPO4 在高温固相反应中 ,分别合成出具有 3种结构类型的新化合物 :新结构类型的三方 Cr2 [BP3 O12 ]、正交 Al PO4 型的 (B,M) [PO4 ](M=Mn,Fe,Co,Ni,Cu,Zn)和新型四方 (Ga,B) PO4 ;用水热法合成出 Na Ga[BP2 O7(OH) 3 ]、Na2 In2 [PO3 (OH) ]4· H2 O和 Na4 Co3 H2 (PO4 ) 4· 8H2 O等新化合物 .同时还讨论了硼磷酸盐化合物研究的最新进展及结构化学的一般规律 .Borophosphates have attracted much attention of scientists in the last few years due to the potential applications of these compounds as functional materials. More than ten new compounds in the related systems have been synthesized and characterized here by either solid state reactions or hydrothermal methods. The new compounds have either new structure types like Cr 2BP 3O 12 which contains new building motif, or with very well known structure type like low cristobalite. The general structural features of these compounds have been discussed together with the literature data, and the new developments of the borophosphate research have also been reviewed here.国家杰出青年基金!(2 0 0 2 510 1);; 国家自然科学基金!(2 970 10 0 4 );; 高等学校骨干教师资助计划;; 福建省自然科学基金!(B981